media: Add MojoCdm study configuration

Add a study configuration in fieldtrial_testing_config.json to enable
MojoCdm on ChromeOS, Linux, Mac and Windows.

BUG=403462

Change-Id: If079581603bc39dab7313501a7b6792261c4fdf5
Reviewed-on: https://chromium-review.googlesource.com/741442
Reviewed-by: John Rummell <[email protected]>
Reviewed-by: Steven Holte <[email protected]>
Commit-Queue: Xiaohan Wang <[email protected]>
Cr-Commit-Position: refs/heads/master@{#513721}
2 files changed